@reven - that is overkill using a Pi for a simple humidity sensor - have you played around with Arduinos at all? I only started last year but you can get your hands on them very cheap and they are perfect for this type of basic sensor task. You can pick up an Uno + Ethernet shield for around $US10-12 from Aliexpress.

I have a few of them around the place speaking to openHAB via MQTT.

The Pi will definitely do the job, just thought I would mention there are much more cost effective ways ;).

SumnerBoy: @reven - that is overkill using a Pi for a simple humidity sensor - have you played around with Arduinos at all? I only started last year but you can get your hands on them very cheap and they are perfect for this type of basic sensor task. You can pick up an Uno + Ethernet shield for around $US10-12 from Aliexpress.

I have a few of them around the place speaking to openHAB via MQTT.

The Pi will definitely do the job, just thought I would mention there are much more cost effective ways ;).

yeah I liked at some Ardunios, but couldnt find a cheap/easy solution to connect one to a network. I wanted a pi anyway to see what kodi is like on it these days, and the humidity sensor I bought will work on an arduino if I figure out how to get one connected to a network (wifi or ethernet).

the esp8266 is very cheap to connect to wifi - its got a micro in it and i think one of the examples someone had done had some form of temperature sensor just going to a webpage it served. They are $3 each or so off aliexpress but you need 3.3v for them so there is the need to level shift etc if you are connecting to a 5v arduino.

I got a board of either aliexpress or ebay that combined a w5100 and avr on the one board and some other stuff but I cant find the link right now and I havent actually done anything with it. But as its all on one board no worry about bulk etc of shields. Claimed arduino compatibility but the headers arent there to take shields, not that you really need them for a temperature sensor.

That is exactly what I am using one of my Ethertens for, a bridge for my Moteino (RF) nodes to my MQTT broker. I have a Moteino connected to the Etherten via the I2C bus, relaying RF messages to MQTT topics. Works great and I can move the gateway around the house to get the best signal for my various remote RF nodes (by just plugging into different RJ45s and patching the POE injector across.

But yeah, very expensive and I won't be using any more in the near future!